Input and Output Devices - R.D.Sivakumar
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This document provides information on various computer input and output devices. It discusses keyboards, mice, scanners, digital cameras, touch screens, magnetic ink character recognition, optical character recognition, light pens, microphones, monitors, printers, speakers, plotters, hard disks, magnetic tapes, floppy disks, and optical disks as common input and output devices and how they are used. The document is written by R.D. Sivakumar and provides details on his educational qualifications and contact information.
Input and Output Devices - R.D.Sivakumar
- 1. R.D.SIVAKUMAR, M.Sc.,M.Phil.,M.Tech., Assistant Professor of Computer Science & Assistant Professor and Head, Department of M.Com.(CA), Ayya Nadar Janaki Ammal College, Sivakasi – 626 124. Mobile: 099440-42243 e-mail : sivamsccsit@gmail.com website: www.rdsivakumar.blogspot.in INPUT AND OUTPUT DEVICES
- 2. INPUT AND OUTPUT DEVICES Input devices - A device that can be used to insert data into a computer
- 3. INPUT DEVICE - KEYBOARD Keyboard is a typewriter –style device. Keyboard has a set of keys to enter letters, numbers, comma, semicolon and other symbols. When the key pressed and produce the corresponding ASCII codes which can be identified by the computer.
- 4. INPUT DEVICE - MOUSE The mouse has a two buttons and one scroller. It controls the cursor on the display screen. The mouse movement is possible only flat surface. We click the mouse button to select an option.
- 5. INPUT DEVICE - SCANNER Scanner is optically scans images, printed text, handwriting, or an object converts into a digital image.
- 6. INPUT DEVICE - BAR CODE READER Bar code reader or scanner is for reading printed codes. It consists of light source, light sensor and lens. The system gives fast and error-free entry of information into the computer. It used in places like supermarket, bookshops.
- 7. INPUT DEVICE - DIGITAL CAMERA Digital camera is used to capture images. It takes photos and send it as digital input to the computer.
- 8. INPUT DEVICE - TOUCH SENSITIVE SCREEN A Touch Sensitive Screen is a pointing device that uses the user to communicate with the computer by touching the screen.
- 9. INPUT DEVICE – MAGNETIC INK CHARACTER RECOGNISTION (MICR) MICR is a character recognition technology. MICR line is at the bottom of cheques are typically includes the document-type indicator, bank code, bank account number, cheque number, cheque amount, and a control indicator. It can be avoids the Human error.
- 10. INPUT DEVICE – OPTICAL CHARACTER RECOGNITION (OCR) OCR is direct reading of any printed character. OCR can scan pa page from a book. The computer will identify the characters in the page as letters, punctuation marks and stores.
- 11. INPUT DEVICE – OPTICAL MARK READING AND RECOGNITION(OMR) OMR reads the pre-printed forms are designed with boxes which can be marked with a dark pencil of ink. OMR enables the processing of hundreds or thousands of documents every hour automatically.
- 12. INPUT DEVICE – LIGHT PEN A Light Pen is a pointing device shaped like a pen and is connected to a monitor. The tip of the light pen contains a light-sensitive element which, when placed against the screen, detects the light from the screen enabling the computer to identify the location of the pen on the screen.
- 13. INPUT DEVICE – MAGNETIC READER This input device reads a magnetic strip on a card. Handy for security reasons, it provides quick identification of the card's owner..
- 14. INPUT DEVICE – NOTES TAKER Notes taker is a device that captures natural handwriting on any surface onto a computer. Using an electronic pen, the notes taker displays the user’s handwritten notes, memos and drawings on the computer and stores the image.
- 15. INPUT DEVICE – MICROPHONE Microphone serves as a voice input devices. It captures the voice data.
- 16. OUTPUT DEVICES OUTPUT devices - A device that can be used to display the output to the computer.
- 17. OUTPUT DEVICE - MONITORS Monitor is a display screen, It provides a visual display of data. Monitors are connected with the computer and are similar in appearance of TV. The common aspect ratio of televisions, and then computer monitors, has also changed from 4:3 (width : height) to 16:9 (and 16:10).
- 18. OUTPUT DEVICE - PRINTERS Printer is prints text or images on paper and other media. Printed material(paper) is called as ‘hard copy’. The two main types of printers are impact printers and non-impact printers.
- 19. TYPES OF PRINTERS – IMPACT PRINTERS Impact Printers – It containing a number of metal pins which strike an inked ribbon placed between the print head and the paper LINE PRINTER DOT MATRIX or SERIAL PRINTER It is High speed printers. Large volumes of text data can print. A line printer can print 150 lines to 3000lines Per minute. Its print quality is low. It is very noisy to print. It prints one line of 8 or 14 points at a time. It is moving across a line similar to typewriters. The printing speed is around 300 characters per second.
- 20. Impact Printers – It containing a number of metal pins which strike an inked ribbon placed between the print head and the paper THERMAL PRINTER It produce images by pushing Electrically heated pins against special heat sensitive paper. LASER PRINTER It can produce good quality graphic images. It use a laser beam(sharp) and dry powdered ink To produce a fine dot matrix pattern. INKJET PRINTER It produces a color print. It combines three colors are Magenta, yellow and cyan. TYPES OF PRINTERS – IMPACT PRINTERS
- 21. OUTPUT DEVICE - SPEAKERS The computer can produce voice output using of speakers. Voice output has become very common in many places like airlines, banks, automatic telephone enquiry system.
- 22. OUTPUT DEVICE - PLOTTERS Plotters are like a printer it produces the graphical output.
- 23. STORAGE DEVICE - HARD DISK Hard disk is a magnetic disk which stores and retrieve the information. Data is arranged as a series of concentric rings. Each ring(track) is subdivided into a number of sectors. Each sectors holding a data(character or bytes).
- 24. STORAGE DEVICE - MAGNETIC TAPE A recording medium consisting of a thin tape with a coating of a fine magnetic strip used for recording digital data. The tape itself is a strip of plastic coated with a magnetic recoding medium.
- 25. STORAGE DEVICE - FLOPPY DISK A floppy disk, or diskette, is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. Floppy disks are read and written by a floppy disk drive (FDD) .
- 26. STORAGE DEVICE - OPTICAL DISK It is a storage medium from which data is read and write by lasers. It is Random access storage medium. The information can be easily read from any point on the disk. CD-ROM stands for Compact Disk - Read Only Memory.
- 27. Thank You..!!